Header height for Highwind please, on deadline

I am having trouble with the header image for Highwind. I can see from the documentation says the full width is 1030. What is the recommended height? Every time I create a header with a new height, it comes back with a demand that I crop the header height in half--no exceptions. I've tried heights of 500, 288, 252, 150. My height preference is 288. Every time I load my image, the software demands I only use the top half. I've got a logo to load, so I need the whole image! What is the actual height and how can I make this work? I'm on a deadline, so quick replies are appreciated. Thanks.